稀土冠醚类配合物的研究 XX: 三价及二价稀土硫氰酸盐与辛二酰双(4'-苯并-15-冠-5)配合物的合成和性质

在乙腈和二氯甲烷混合溶液中合成了三价稀土元素(La, Nd, Eu, Dy, Er, Yb)硫氰酸盐与辛二酰双(4'-苯并-15-冠-5)的六个新配合物。并在氩气氛中, 以四氢呋喃为溶剂, 锂-萘为还原剂, 制得了二价铕硫氰酸盐与辛二酰双(4'-苯并-15-冠-5)的固体配合物。通过元素分析、红外光谱、差热热重分析、荧光光谱、穆斯堡尔谱、电子自旋共振谱、还原性实验等研究了双冠醚与稀土离子的配位作用, 并讨论了三价和二价稀土配合物在物理化学性质上的差别。

Studies on rare earth complexes with crown ethers XX: Synthesis and characterization of the complexes of rare earth elements (III, II) with octandioyl-bis (B-15-C-5)

Ln(SCN)3.OBB.nH2O and 2La(SCN)3.OBB.2H2O [Ln = Nd, Eu, Dy, Er, Yb; OBB = octanedioylbis(4'-benzo-15-crown-5); n = 1-5] were prepared Eu(SCN)2.OBB.THF.3H2O was also prepared under Ar being isolated from water and oxygen by reducing of the Eu(III) complex with the reagent Li/naphthalene in THF. The complexation of the rare earth ions with the bis(crown ether) and the differences between di- and trivalent europium complexes were established on the basis of elemental anal., TGA, DTA, ESR, IR, and Moessbauer spectra. The luminescence properties of the complexes were also studied.